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NEC Internal Use Only 1 26-May-2008 NEC Islamabad Telenor-NEC Microwave Quality Standard
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NEC Internal Use Only 1 26-May-2008 NEC Islamabad Telenor-NEC Microwave Quality Standard.

Jan 17, 2016

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PowerPoint Date
NEC-ISB H Ishii
When performing hazardous work or entering potentially hazardous area wear
protective equipment, such as safety belt / head or eye protection.
Smoking or open flame are prohibited on operation area.
Properly remove and dispose of all unused hazardous materials.
Comply with hazardous material documentation and reporting requirement.
After using power tool or any other equipment, they must be cleaned and put in storage on daily basis.
Keep all tool within designated work area.
When cutting any kind of material safety glasses must be used .
When handling conducting cable, the cable ends must be taped & insulated.
All accidents on-site must be reported to appropriate personal immediately.
NEC Internal Use Only
Mark the four holes with two base plates.
Drill the marked hole.
Fix the Rawal bolts.
Installed the rack (Distance from rear wall at least 200mm).
Check the leveling of the rack.
Install the grounding bus bar at upper rear side of 19" rack.
Install the blind panel in front of grounding bus bar.
Separate grounding of 19" rack should be done in shortest possible route.
NEC Internal Use Only
19” rack
Blind Panel at front of bus bar
Base plate
NEC Internal Use Only
Grounding for 19" Rack
Label for IDU
DC PDB installation with four screws
Grounding of DC PDB.
Circuit breaker for IDU & C-Node is 6 amperes.
PDB Grounding
0 VDC
DC PDB Inner view
NEC Internal Use Only
Rectifier Circuit breakers for NEC Equipment
32 amperes circuit breaker for DC PDB with 5 branch circuit breakers and 60 amperes circuit breaker for DC PDB with 10 branch circuit breakers.
Rectifier CBs for NEC Equipment at out door site
Rectifier CBs for NEC Equipment at indoor site
NEC Internal Use Only
Indoor Unit Installation
Before installing IDU in 19" rack ,should be retighten the screws of bracket while correcting two brackets to 90º for IDU mount horizontally.
NEC Internal Use Only
IDU must be installed with four screw, along with washers.
All screws must be securely tighten.
All screws must be of same size ( M5 ).
IDU must be separately grounded with bus bar.
Grounding thimble must be properly crimped.
IDU must be labeled with far end ID.
Indoor Unit Installation
Space between two IDUs
Space between two IDUs must be 1 U* for radiation of heat.
Space between two units will be1 U
*1U = 1.75inches = 44.45mm
C-Node Installation
Unpack and inspect received equipment for any damage and missing material
Site preparation as per define layout.
Mount C-node sub rack in 19" rack.
Fasten the sub rack to the 19" rack with appropriate (M6) screws.
Ensure proper length and routing of fiber/E1s cables.
Use Flexible pipe for fiber patch cord when laid out of 19" rack .
C-Node tributary/E1 cables arrangement
Fiber patch cord
Use Flexible pipe for fiber patch cord when laid out of 19" rack .
NEC Internal Use Only
DDF Installation
The E1 cable is to be stripped with sufficient length to reach DDF, unused wires to be cut and PVC tape must be used at the ends.
The E1 cable must be arranged and neatly run around the 19" rack to the DDF panel.
No extra cable should be left in side the rack.
Grounding of DDF/DDP must be ensured.
DDF/DDP should be installed at bottom of rack.
Cable arrangement on DDF panel rear view
Cable arrangement on DDF panel front view
NEC Internal Use Only
E1s patching on DDF
Cable layout &Termination
E1s cable and DC, AC power cable must be run separately along the cable rack as standard rule for cable management.
Use flexible pipe for power cable/ optical fiber patch cords.
Use surge arrestor for IF cable.
All grounding cable must be of shortest possible length.
Cable layout
Grounding Cable
Surge Arrestors
Cable Color and Size
* For sites in MSC the DC PDB power cable is blue, black
** Prefabricated power cable with black jacket
Application
color
Red - Black
Yellow-Green color grounding cable.
Thimbles must be as per cable size.
Use proper crimping tool to crimp the thimble.
Grounding resistance less than 10 ohm.
Ground connections must be securely tighten.
No multiple connections with single point / thimble.
In case there is no point available for the grounding, it should be informed to the TP implementation team.
Grounding of surge arrestors.
NEC Internal Use Only
Following equipment labeling is mandatory for effective O&M activity.
19" rack with near end site ID.
Each hop with far end site ID.
IF cables for main /stand by system.
E1s cables .
Power cables for main/stand by system.
Rectifier circuit breaker for NEC equipment.
DC PDB branch circuit breaker with far end ID.
Surge arrestor for main/stand by system.
DC PDB labeling if more than one PDB is installed at the site.
NEC Internal Use Only
verify the contents against packing list.
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Antenna Assembling
Assemble the mounting bracket with the antenna (Different sizes of antenna requires different mounting brackets, refer to the manual that comes along with the antenna for details)
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Antenna Assembling
Position the antenna to the mounting bracket then place the mounting screws and tighten
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There are typical four kind of connection ways to antenna
1- ODU Direct
Use enough man power for lifting and installation of antenna.
Use rope and pulley for antenna installation.
Take extra care while lifting the big size antenna (1.8m) or lifting the antenna to high points.
Hold the antenna using Rope from down side during the lifting so that antenna do not touch the tower by the wind.
Use proper PPE (Personal Protective Equipment) when lifting the antenna.
NEC Internal Use Only
*
Take out the ODU from the box, inspect it carefully for any damage.
Antenna Mounting with ODU Direct
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Antenna Mounting with ODU Direct
Fix the ODU to the bracket with four screws (tightening torque is 4.0 N.m +/- 10% recommendation).
Be careful not to damage the O-ring (Antenna).
Polarization should be according to link plan.
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Antenna Mounting with Transducer
Assemble the antenna, fix the ODU to the bracket by tightening the M6 screws (four locations) & ensure it is firmly fixed. IF connector should be sealed according to standard both from ODU & antenna (Transducer) side.
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Antenna Mounting with Flexible Waveguide
Assemble the antenna, fix the ODU to the bracket by tightening the M6 screws (four locations) & ensure it is firmly fixed. Waveguide should be sealed according to standard both from ODU & antenna side.
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Antenna Mounting with Hybrid
Assemble the antenna with Hybrid, fix the ODU to the bracket by tightening the M6 screws (four locations) & ensure it is firmly fixed. IF connector should be sealed according to standard both from ODU & antenna (Hybrid) side.
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Side Strut Position
Antenna Offsetting & Side Strut should be positioned in such a way that there should be a suitable bending radius of IF cable/Waveguide, also the antenna should be free to move 25 degrees (Left Offset) or 25 degrees (Right Offset) if required
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IF Cable Run and Fixing
Black UV protect tie-wrap (310×4.3 mm) used to fix IF cable by cross
tightens for vertical and horizontal cable run at 1.2m intervals.
The IF cable not to be over tightened to avoid any deformation to IF cable.
1.2m
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IF Cable Run and Fixing
IF cables installed on horizontal rack; silicon applied at porthole to ensure no water seepage
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2 meter IF cable loop on tower behind antenna
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Water proofing of WG and IF cable at ODU end
Water proofing with self bonding and again with Plastic (PVC) tape three layers each.
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Grounding
Separate grounding point used for each cable, If no space available at bus bar
then both side of grounding bus bar can be used for two groundings only.
Single point ground termination
NEC Internal Use Only
ODU must be separately Grounded with grounding clamp on tower.
Thimbles must be crimped with proper crimping tool.
Up to 0.6m antenna the Cable length will be at least 0.8 meter.
Ground terminations must be securely tighten at both ends.
Separate clamp for both ODUs
Up to 1.2m antenna the Cable length will be at least 1meter.
Thimble
The ODU grounding cable should be as short as possible.
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At Horizontal cable Tray
At vertical cable Tray
IF cable grounding depends on the height of tower for more than 20 meter height; First grounding will be
at vertical cable tray and second will be on horizontal cable tray prior to enter into Roxtec porthole .For less
than 20 meter IF grounding will one time on vertical or horizontal cable tray depending on availability of
grounding bus bar.
Grounding kits must be properly terminated with each IF cable.
Separate grounding point of bus bar should be used for each IF cable.
Water proofing with self bonding followed by PVC tape three layers each time.
Thimble must be crimped with proper crimping tool and securely tighten with grounding bus bar
Black UV protect tie-wrap (310×4.3 mm) used at both ends of grounding kit for each IF cable.
Half of each turn must cover previous turn of tape while wrapping tape on the grounding kits
PVC tape wrapping
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ODU metal label and Direction Tag tied with IF cable
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